A method to realize fast reroute and router

Abstract

The embodiment of the invention discloses a method and a router for realizing fast reroute. The method of the invention example comprises that: the main network IP router and the spare virtual private network VPN router is down sent into the route forwarding table of network provider boundary routing equipment PE; the local PE and CE adopt bidirectional forwarding detection to check the link failure; when the link failure is detected, the flow are all switched to the spare VPN router to be forwarded. By adopting the method of the embodiment of the invention, the local PE-CE link failure can be rapidly detected and the main network IP router and the spare virtual private network VPN router can be down sent to the route forwarding table of network provider boundary routing equipment PE. The rapid detection of failure in the local PE-CE link is helpful to realize rapid convergence of VPN business and satisfies the real-time business requirement of the users.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and a router for realizing fast rerouting. Background technique [0002] VPN (VirtuaI Private Network, Virtual Private Network) is a technology that relies on Internet Service Providers (ISP, Internet Service Provider) and Network Service Providers (NSP, Network Service Provider) to establish private data communication networks in public networks. In VPN, the PE (Provider Edge, network provider edge routing device) in the public network establishes a connection with the CE (Client Edge, customer edge routing device) in the private network, and CEs belonging to the same private network can communicate through the public network. Communication, realizing the establishment of a private data communication network in the public network. [0003] With the wide application of VPN technology, operators attach great importance to the speed of service convergence when the network fails....

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Problems solved by technology

[0008] In the process of realizing the present invention, the inventor found that the above-mentioned prior art has at least the following disadvantages: relying on routing protocols to realize local CE-PE fault detection can only guarantee second-level detection, and when VPN services fail due to local PE-CE link failure In the case of business interruption, the fault detection time of the existing solution is too long

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